Effects of azadirachtin, cypermethrin, methoxyfenozide and pyridalil on functional response of Habrobracon hebetor Say (Hym.: Braconidae)
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Department of Plant Protection, College of Agriculture, University of Maragheh Maragheh, 55181-83111, Iran
Department of Plant Protection, College of Agriculture, Azarbaijan University of Tarbiat Moallem 5375171379, East-Azarbaijan, Tabriz, Iran
Moosa Saber
Department of Plant Protection, College of Agriculture, University of Maragheh Maragheh, 55181-83111, Iran
Journal of Plant Protection Research 2012;52(3):353–358
Habrobracon hebetor Say is one of the most important natural enemies of the Helicoverpa armigera Hübner (Lep.: Noctuidae) . In this study, the sublethal effects of LC 30 concentration of azadirachtin, cypermethrin, methoxyfenozide and pyridalil on the functional response of H. hebetor to different densities of 5th instars larvae of Ephestia kuehniella Zeller were evaluated. Young females were exposed to LC 30 of the insecticides for an appropriate time of exposure. Then, six randomly selected alive females were transferred individually to plastic Petri dishes (10 cm in diameter) and supplied with the following densities: 2, 4, 8, 16, 32 and 64 of 5th instars of E . kuehniella for 24 h. Eight replicates were considered for each insecticide treatment and the control. The results revealed a type II functional response in the control, and all of the insecticide treatments. This study showed that the control and the cypermethrin treatment had the shortest (0.4143 h) and longest (0.624 h) handling time, respectively. The highest (0.0035 per hour) and lowest (0.0029 per hour) attack rate was observed in pyridalil and cypermethrin treatments, respectively. Based on values of handling time, cypermethrin had the highest adverse effect on host-finding in H. hebetor .
The authors have declared that no conflict of interests exist.
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